Christmas tree



FIG. 1 is a front elevation view of a Christmas tree, showing my new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a front perspective view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings represent portions of the Christmas tree that form no part of the claimed design. 

CLAIM The ornamental design for a Christmas tree, as shown and described. 